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3 years ago

Perpendicular slope to 3x-y=4

Physics

1 answer:

Mashcka [7]3 years ago

4 0

Perpendicular slope would be 1/3. so the equation will be Y=1/3x -4

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Did I do these questions correctly?

SOVA2 [1]

Yes, they seem right to me.

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3 years ago

Which of the following is NOT true about energy conversion devices?

konstantin123 [22]

Answer:

Explanation:

Option A, B and C are true about energy conversion devices, only option D is NOT true about energy conversion devices.

5 0

3 years ago

Explain how evaporation cools a liquid

MAVERICK [17]

When evaporation occurs liquid absorbs heat from the surroundings to get converted to its vapour form as a result, there is an overall decrease in the heat leading to cooling of the liquid.

Hope that this was helpful :)

8 0

2 years ago

An object with more mass has more kinetic energy than an object with less

Ber [7]

Explanation:

The kinetic energy of an object is given in terms of its mass and object as :

$K=\dfrac{1}{2}mv^2$

An object with more mass has more kinetic energy. An object with less mass, if both objects are moving at the same speed, in opposite directions, will have less kinetic energy. The square of v will give positive number.

4 0

3 years ago

At what rate would heat be lost through the window if you covered it with a 0.750 mm-thick layer of paper (thermal conductivity

igor_vitrenko [27]

The given question is incomplete. The complete question is as follows.

A picture window has dimensions of 1.40 m, 2.50 m and is made of glass 6.00 mm thick. On a winter day, the outside temperature is $-15^{o}C$ , while the inside temperature is a comfortable $21.0^{o}C$ .

Part A

At what rate is heat being lost through the window by conduction?

Express your answer using three significant figures.

Part B

At what rate would heat be lost through the window if you covered it with a 0.750 mm-thick layer of paper (thermal conductivity 0.0500 W/m?K)?

Express your answer using three significant figures.

Explanation:

Formula for rate of heat transferred through single thick plane of glass is as follows.

$(\frac{Q}{\Delta t)}_{single} = \frac{A(T_{h} - T_{c})}{\frac{L_{ghss}}{K_{ghss}}}$

= $\frac{1.4 \times 2.5 m^{2} \times 36^{o}C}{\frac{6.0 mm}{0.8 W/m K}}$

= $16.8 \times 10^{3} W$

When window is covered by paper then the rate of heat transfer is as follows.

$(\frac{Q}{\Delta t)}_{single} = \frac{A(T_{h} - T_{c})}{\frac{L_{ghss}}{K_{ghss}} + \frac{L_{paper}}{K_{paper}}}$

= $\frac{(1.4 \times 2.5 m^{2} \times 36^{o}C}{\frac{6.0 mm}{0.8 W/m K} + \frac{0.75 mm}{0.05 W/m K}}$

= $5.6 \times 10^{3} W$

Thus, we can conclude that heat lost is $5.6 \times 10^{3} W$ .

3 0

3 years ago